<template>
  <el-menu
    default-active="1-4-1"
    class="el-menu-vertical-demo"
    @open="handleOpen"
    @close="handleClose"
    :collapse="isCollapse"
    background-color="#545c64"
    text-color="#fff"
    active-text-color="#ffd04b"
  >
    <h3>{{ isCollapse ? '后台' :'通用后台管理系统' }}</h3>
    <el-menu-item
      @click="clickMenu(item)"
      v-for="item in noChildren"
      :key="item.name"
      :index="item.name"
    >
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label }}</span>
    </el-menu-item>

    <el-submenu
      v-for="item in hasChildren"
      :key="item.label"
      :index="item.label"
    >
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item @click="clickMenu(subItem)" :index="subItem.name">{{ subItem.label }}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<style lang="less">
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 100vh;
  h3 {
    color: #fff;
    line-height: 48px;
    text-align: center;
  }
}
</style>

<script>
import Cookie from 'js-cookie';
export default {
  data() {
    return {};
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
    //点击菜单
    clickMenu(item) {
      console.log(item);
      //当页面路由与跳转路由不一致才允许跳转
      if(this.$route.path !==item.path && !(this.$route.path === '/home' && (item.path === '/'))){
        this.$router.push(item.path)
      }
      this.$store.commit('selectMenu',item)
    },
  },
  computed: {
    // 没有子菜单
    noChildren() {
      return this.menuData.filter((item) => !item.children);
    },
    // 有子菜单
    hasChildren() {
      return this.menuData.filter((item) => item.children);
    },
    menuData(){
      // 逻辑判断 当前数据如果缓存没有，当初store中货区
      return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
    },
    isCollapse(){
      return this.$store.state.tab.isCollapse
    }
  },
};
</script>

<style lang="less" scoped>
.el-menu{
  border-right: none;
}
</style>